package com.du.dumall.product.service.impl;

import com.du.dumall.product.service.CategoryBrandRelationService;
import com.fasterxml.jackson.databind.util.JSONPObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.du.dumall.common.utils.PageUtils;
import com.du.dumall.common.utils.Query;

import com.du.dumall.product.dao.CategoryDao;
import com.du.dumall.product.entity.CategoryEntity;
import com.du.dumall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);
        List<CategoryEntity> collect = categoryEntities.stream().filter(entity ->
                entity.getParentCid() == 0
        ).map(meun ->{
            meun.setChildren(getChildrens(meun,categoryEntities));
            return meun;
        }).sorted((mune1, mune2) -> {
            return (mune1.getSort() == null?0:mune1.getSort()) - (mune2.getSort()== null?0:mune2.getSort());
        }).collect(Collectors.toList());
        return collect;
    }

    @Override
    @Transactional
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCascade(category.getCatId(),category.getName());

    }


    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return (categoryEntity.getParentCid().compareTo(root.getCatId())) == 0;
        }).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2、菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }


}